Abstract: A solar tracking system for controlled movement of an array of solar panels and a method for installing the system is provided. The system includes an elongate drive shaft rotatable about a central axis and mechanically coupled to an array of solar panels which are rotatable about the drive shaft. A plurality of posts support the drive shaft along the length of the drive shaft, and a plurality of couplers couple the posts to the drive shaft in a manner that facilitates adjustment of the position and orientation of the couplers relative to the posts during installation of the system, and in a manner which minimizes the contact area between the couplers and the drive shaft to reduce the torque and power requirements of the system.

Abstract: Sealed synthetic resin containers are spin welded by bringing opposed, generally complimentary horizontal mating surfaces of the lid and bowl into contact under a predetermined axial pressure and rapidly accelerating rotation of the lid relative to the bowl while maintaining substantially the axial pressure to produce melting of the mating surfaces until a desired torque value is attained. Thereafter, the rotation of the lid is immediately decelerated to terminate the rotation and allow the mating surfaces to bond. Generally, the torque is monitored repeatedly during the accelerating rotation until a plateau is reached and the accelerating step is continued for at least 50 milliseconds thereafter.